Choice "A" is correct. A C corporation's net capital losses are carried back three years and forward five years.
Choice "b" is incorrect. This is incorrect because it states the rule for an individual taxpayer.
Choice "c" is incorrect. A corporation's capital losses can be used only to offset capital gains, and any excess is carried back three years and forward five years.
Choice "d" is incorrect. A C corporation's net operating losses may be carried back two years and forward twenty years.